Port Colborne Weather Records (CA006136606)

Record envelope, standing records and threshold days for Port Colborne (CA006136606), Ontario, Canada, with 61 years of record.

Key Facts for Port Colborne

Port Colborne (CA006136606) is a weather station in Ontario, Canada at 42.88 latitude and -79.25 longitude, 175 m (574 ft) above sea level.
The station reports from 1964 to 2024, 61 years of record.
1,464 records set at Port Colborne still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Ontario, Canada, 42.88 latitude, -79.25 longitude.
Elevation: 175 m (574 ft).
Period of record: 1964 to 2024, 61 years.
Eligible elements: none yet.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Port Colborne. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Port Colborne, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	13.3 C (55.9 F)	-26.0 C (-14.8 F)	n/a	n/a
Feb	16.0 C (60.8 F)	-25.0 C (-13.0 F)	n/a	n/a
Mar	21.7 C (71.1 F)	-24.0 C (-11.2 F)	n/a	n/a
Apr	26.1 C (79.0 F)	-11.5 C (11.3 F)	n/a	n/a
May	30.0 C (86.0 F)	-3.5 C (25.7 F)	n/a	n/a
Jun	31.0 C (87.8 F)	2.2 C (36.0 F)	n/a	n/a
Jul	33.0 C (91.4 F)	8.5 C (47.3 F)	n/a	n/a
Aug	30.6 C (87.1 F)	5.0 C (41.0 F)	n/a	n/a
Sep	30.0 C (86.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	27.2 C (81.0 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	20.0 C (68.0 F)	-11.1 C (12.0 F)	n/a	n/a
Dec	17.0 C (62.6 F)	-26.0 C (-14.8 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Port Colborne still stand. 1976 holds the most, with 97.

Standing records at Port Colborne by the year they were set
Year set	Standing records
1964	54
1965	89
1966	78
1967	89
1968	64
1969	55
1970	72
1971	79
1972	65
1973	86
1974	59
1975	85
1976	97
1977	60
1978	65
1979	97
1980	61
1981	51
1982	75
1983	83

Wettest Day of Each Month

Jun: 108.7 mm (4.3 in)

The wettest day on record for each calendar month at Port Colborne. The most was 108.7 mm (4.3 in) on 25 June 1968.

Record daily precipitation for each month at Port Colborne
Month	Record daily precipitation (mm)	Date
Jan	40.6 mm (1.6 in)	22 January 1966
Feb	33.5 mm (1.3 in)	19 February 1972
Mar	34.0 mm (1.3 in)	1 March 1972
Apr	36.6 mm (1.4 in)	22 April 1977
May	36.1 mm (1.4 in)	6 May 1976
Jun	108.7 mm (4.3 in)	25 June 1968
Jul	63.2 mm (2.5 in)	12 July 1964
Aug	59.4 mm (2.3 in)	22 August 1968
Sep	90.8 mm (3.6 in)	13 September 1979
Oct	55.5 mm (2.2 in)	5 October 1983
Nov	46.2 mm (1.8 in)	19 November 1969
Dec	31.5 mm (1.2 in)	10 December 1969

Period of Record Coverage

1964 to 1983

20 years of record at Port Colborne, 1964 to 1983. 1 years have data for under 90 percent of days and are left out of rankings: 1964.

Days with data per year at Port Colborne
Year	Days with data	Share of year	Complete
1964	183	50%	No
1965	364	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	364	100%	Yes
1982	358	98%	Yes
1983	363	99%	Yes

Latest Records

No records were set at this station in the latest data.

Climate Trend

19 complete years, 1965 to 1983

One stripe for each of 19 complete years at Port Colborne, 1965 to 1983. Blue stripes are years cooler than the station's own mean of 8.3 C (46.9 F); red stripes are warmer. The coolest year was 1978, at 7.3 C (45.1 F), and the warmest was 1973, at 9.5 C (49.2 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Port Colborne as warming stripes, 1965 to 1983
Year	Annual mean temperature	Difference from the station mean
1965	8.0 C	-0.35 C
1966	8.2 C	-0.07 C
1967	8.4 C	+0.11 C
1968	8.0 C	-0.35 C
1969	8.5 C	+0.16 C
1970	8.5 C	+0.20 C
1971	8.6 C	+0.31 C
1972	7.8 C	-0.47 C
1973	9.5 C	+1.24 C
1974	8.3 C	+0.02 C
1975	9.4 C	+1.06 C
1976	7.7 C	-0.58 C
1977	8.1 C	-0.18 C
1978	7.3 C	-1.01 C
1979	8.1 C	-0.25 C
1980	7.7 C	-0.62 C
1981	8.0 C	-0.29 C
1982	8.3 C	+0.02 C
1983	9.3 C	+1.04 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1964 to 1983

Yearly extremes at Port Colborne: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.0 C (91.4 F)	1979	30.0 C (86.0 F)	20
Coldest night (TNn)	-26.0 C (-14.8 F)	1980	-20.6 C (-5.1 F)	20
Wettest day (Rx1day)	108.7 mm (4.3 in)	1968	38.5 mm (1.5 in)	20
Wettest five days (Rx5day)	123.8 mm (4.9 in)	1979	69.7 mm (2.7 in)	20
Longest dry spell (CDD)	26 days	1964	15 days	20

Hottest day (TXx)

The hottest day of the year at Port Colborne, 1964 to 1983. The record is 33.0 C (91.4 F) in 1979, marked on the chart; the median year is 30.0 C (86.0 F).

Hottest day (TXx) at Port Colborne by year
Year	Hottest day (TXx)
1964	31.7 C (89.1 F)
1965	28.9 C (84.0 F)
1966	30.0 C (86.0 F)
1967	30.0 C (86.0 F)
1968	30.6 C (87.1 F)
1969	29.4 C (84.9 F)
1970	30.6 C (87.1 F)
1971	30.0 C (86.0 F)
1972	30.0 C (86.0 F)
1973	31.1 C (88.0 F)
1974	29.4 C (84.9 F)
1975	30.6 C (87.1 F)
1976	28.9 C (84.0 F)
1977	29.5 C (85.1 F)
1978	31.0 C (87.8 F)
1979	33.0 C (91.4 F)
1980	29.5 C (85.1 F)
1981	28.5 C (83.3 F)
1982	30.5 C (86.9 F)
1983	31.0 C (87.8 F)

Coldest night (TNn)

The coldest night of the year at Port Colborne, 1964 to 1983. The record is -26.0 C (-14.8 F) in 1980, marked on the chart; the median year is -20.6 C (-5.1 F).

Coldest night (TNn) at Port Colborne by year
Year	Coldest night (TNn)
1964	-12.2 C (10.0 F)
1965	-20.0 C (-4.0 F)
1966	-20.6 C (-5.1 F)
1967	-20.6 C (-5.1 F)
1968	-20.0 C (-4.0 F)
1969	-18.3 C (-0.9 F)
1970	-21.7 C (-7.1 F)
1971	-20.0 C (-4.0 F)
1972	-20.6 C (-5.1 F)
1973	-22.2 C (-8.0 F)
1974	-20.6 C (-5.1 F)
1975	-16.1 C (3.0 F)
1976	-23.9 C (-11.0 F)
1977	-22.2 C (-8.0 F)
1978	-23.0 C (-9.4 F)
1979	-25.0 C (-13.0 F)
1980	-26.0 C (-14.8 F)
1981	-26.0 C (-14.8 F)
1982	-25.0 C (-13.0 F)
1983	-16.0 C (3.2 F)

Wettest day (Rx1day)

The wettest day of the year at Port Colborne, 1964 to 1983. The record is 108.7 mm (4.3 in) in 1968, marked on the chart; the median year is 38.5 mm (1.5 in).

Wettest day (Rx1day) at Port Colborne by year
Year	Wettest day (Rx1day)
1964	63.2 mm (2.5 in)
1965	36.6 mm (1.4 in)
1966	40.6 mm (1.6 in)
1967	36.3 mm (1.4 in)
1968	108.7 mm (4.3 in)
1969	46.2 mm (1.8 in)
1970	32.5 mm (1.3 in)
1971	29.0 mm (1.1 in)
1972	36.3 mm (1.4 in)
1973	38.1 mm (1.5 in)
1974	38.9 mm (1.5 in)
1975	33.5 mm (1.3 in)
1976	38.1 mm (1.5 in)
1977	48.0 mm (1.9 in)
1978	42.0 mm (1.7 in)
1979	90.8 mm (3.6 in)
1980	38.0 mm (1.5 in)
1981	41.2 mm (1.6 in)
1982	34.8 mm (1.4 in)
1983	55.5 mm (2.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Port Colborne, 1964 to 1983. The record is 123.8 mm (4.9 in) in 1979, marked on the chart; the median year is 69.7 mm (2.7 in).

Wettest five days (Rx5day) at Port Colborne by year
Year	Wettest five days (Rx5day)
1964	68.5 mm (2.7 in)
1965	57.9 mm (2.3 in)
1966	54.4 mm (2.1 in)
1967	79.7 mm (3.1 in)
1968	120.4 mm (4.7 in)
1969	87.6 mm (3.4 in)
1970	53.2 mm (2.1 in)
1971	66.6 mm (2.6 in)
1972	60.0 mm (2.4 in)
1973	89.3 mm (3.5 in)
1974	105.4 mm (4.1 in)
1975	48.0 mm (1.9 in)
1976	81.3 mm (3.2 in)
1977	94.0 mm (3.7 in)
1978	70.8 mm (2.8 in)
1979	123.8 mm (4.9 in)
1980	62.4 mm (2.5 in)
1981	63.6 mm (2.5 in)
1982	86.9 mm (3.4 in)
1983	67.4 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Port Colborne, 1964 to 1983. The record is 26 days in 1964, marked on the chart; the median year is 15 days.

Longest dry spell (CDD) at Port Colborne by year
Year	Longest dry spell (CDD)
1964	26 days
1965	11 days
1966	16 days
1967	12 days
1968	12 days
1969	18 days
1970	19 days
1971	16 days
1972	11 days
1973	18 days
1974	13 days
1975	13 days
1976	18 days
1977	13 days
1978	17 days
1979	10 days
1980	25 days
1981	11 days
1982	16 days
1983	11 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

Data for Port Colborne standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Port Colborne threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of 2026-10-13. Last revised 13 October 2026 (2026-10-13).